<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .mi {
            height: 300px;
            /*width: 300px;*/
            margin: 0 auto;
            /*background-color: pink;*/
        }

        .mi .header {
            margin: 0 auto;
            height: 40px;
            background-color: #333333;
        }

        .mi .main {
            height: 560px;
            width: 1226px;
            margin: 0 auto;
        }

        .one {
            height: 100px;
            width: 1226px;
            background-color: #ffc0cb;
        }

        .two {
            height: 460px;
            width: 234px;
            background-color: #ffa500;
            float: left;
        }

        .three {
            height: 460px;
            width: 992px;
            background-color: #87ceeb;
            float: left;
        }
    </style>
</head>
<body>
<div class="mi">
    <div class="header">
    </div>
    <div class="main">
        <div class="one"></div>
        <div class="two"></div>
        <div class="three"></div>
    </div>
</div>
</body>
</html>